Hydrophobic polyelectrolyte coagulants for concentrating coal tailings
AssigneeNalco Chemical Company
InventorsManian Ramesh, Ram A. Venkatadri, Lawerence J. Connelly, Jeffrey R. Cramm
Life of this patent
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Abstract
A method for concentrating coal tailings which comprises steps of: feeding the coal tailings to a thickener; treating the coal tailings with a hydrophobic polyelectrolyte copolymer coagulant which comprises diallyldimethylammonium chloride and a more hydrophobic monomer, the coagulant is added to the coal tailings in an amount between about 0.05 to about 0.25 lb/ton; treating the coal tailings with a flocculant in an amount between about 0.05 to about 0.25 lb/ton; discharging substantially concentrated tailing; and withdrawing substantially clarified liquid from the thickener.
Claims7
A method for concentrating coal tailings which include liquid and colloidal particles, said method comprising the steps of:
- a. feeding said coal tailings to a thickner;
- b. treating said coal tailings with a hydrophobic polyelectrolyte copolymer coagulant which comprises diallyldimethylammonium chloride monomer and a hydrophobic monomer selected from the group consisting having of:
- dialkylaminoethylacrylates having from C.sub.4 to C.sub.20 quaternaries and dialkylaminoethylmethacrylates having from C.sub.4 to C.sub.20 quaternaries, said coagulant is added to the coal tailings in an amount between about 0.05 to about 0.25 lb/ton;
- c. treating said coal tailings with a flocculant in an amount between about 0.05 to about 0.25 lb/ton, whereby said colloidal particles agglomerate and settle out as concentrated tailings;
- d. discharging concentrated tailings from said thickener;
- and
- e. withdrawing clarified liquid from said thickener.
The method according to claim wherein said dialkylaminoethylmethylacrylate are either dimethyaminoethylmethacrylate benzyl chloride quaternary or dimethylaminoethylmethacrylate cetyl chloride quaternary.
Dependencies are inferred from the claim text.